Due to the inherent nature of NP3 Coating, tooling marks may be present on SIONICS NP3 Coated Bolt Carrier Groups. Tooling marks are COSMETIC and have ZERO effect on function. Being that the NP3 Coating impregnates into the host material, it is much thinner and much less forgiving in hiding Tooling Marks. Other popular coatings such as Phosphate and Nitride…
Here at SIONICS, we test fire EVERY BCG, upper receiver group, and firearm. Our test firing process is simple: BCGs get 5 rounds of M193 and another single round in a separate magazine to ensure function, ejection pattern, and lock-back. All upper receiver groups and firearms get 7 rounds of M193 and another single round in a separate magazine to ensure…
Sprinco AR-15 Extractor Springs are made from high quality Chrome Silicon wire stock that has been heat treated, stress relieved, and cryogenically processed to produce long lasting durability. 5-Coil springs provide a higher spring pressure than OEM springs for use in all AR-15 pattern rifles and performs well even if the rifle is dirty.
All SIONICS products are warranted against defects in material and workmanship for the life of the original retail purchaser. For more information refer to the terms and conditions page.
We choose to use the OCKS (Optimized Carrier Key Screws) because of their unique design features. There are twelve splines on the heads, giving depressions and projections for carrier key metal to stake/flow into and engage like gear teeth. This makes sure we’ve got the best possible retention of carrier key screws.
Shot peening is a process used to make metals more stress-resistant. It is commonly used in engine pistons. However, it is also used to make the SIONICS bolt carrier groups more durable and long-lasting.
Of course. Phosphate coatings are porous and absorb oil and lubrication well by design. These are current Mil-Spec by the U.S. Military. When used in conjunction with quality external oils, a phosphate coating will protect the external of the BCG from corrosion. But, you must lubricate phosphate finishes regularly to give that protection. NP3 is an Electroless Nickel coating with embedded TEFLON.…
Since the gas key wears out before any other components, the key is made as a separate component and bolts to the body of the carrier. To ensure the key doesn’t get loose after being subjected to gas and recoil, SIONICS BCGs are hand staked utilizing a Michiguns MOMOAKS staking jig. Staking the key in the MOMOAKS creates a much…
These are two types of testing we do on all of our Bolt Carrier Groups. HPT or High Pressure Testing, is another test performed by firing a high-pressure cartridge through the BCG being tested. HPT is done first to expose any potential flaws in the bolt. Then MPI testing is done to find any flaws or potential flaws. MPI or…
Carpenter No. 158 steel is the mil-spec steel used for fabricating the bolt itself. This type of steel provides the best performance and lifespan for the BCG. C158 is case- (or surface-) hardened. This means the exterior of the steel is made to be very hard, preventing cracking and surface wear. Inside, the steel is softer and more flexible, preventing deformation…